Improvement in screws



UNITED STATES PATENT OEEIGE.

JOHN ABSTERDAM, 0F NEV YURK, N. Y.

IMPROVEMENT IN SCREWS.

Specification forming part of Letters Patent No. 55.964, dated October 9,3, 1866.

To all whom it may concern:

Beit known that 1, JOHN ABSTERDAM, of the city, county, and State of New York, have invented a new land useful Improvement in food-Screws; and do hereby declare the same is fully described and represented in the fellowing specification and the accompanying drawings, ot' which- Figure l represents a sectional view ot a wooden disk in which are inserted, for comparison, specimens ot' wood-screws now in use and those of my invention; and Fig. 2, a section at right angles to the saine 0u line a: .zu

The nature ot' my invention eonsistsjn con structing or forming a wood-screw with a boring-point at any desired distance beyond the threaded portion thereof, said point being either conical, pyramidal, or chisel shaped, (like a carpenters piercer,) for purposes hereinafter explained.

In the drawings, A represents the old square or blunt end screw; B, the more modern or gimlet screi T; and C D E F, wood-screws with conical, pyrainidal, and chisel shaped boringpoints G H I, projecting beyond the threaded portion J, which comprise my invention.

In connecting pieces of wood, or wood and metallic substances, the usual method is to drive with a hammer the old square-end or ginilet wood'screw one-halt' of its length, or nearly so, into the wood, and by means of a screwdriver the remaining portion, thus cutting or breaking in a portion of the fibers ot' the wood, and forming a hole equal in diameter to the body of the screw, the broken bers invariably clogging up the threads ofthe portion of the screw so driven, destroying the function or proper action of the screw because ot' its form, which is proved by the fact of the screw dropping ont after some jarring or vibration ot the wood.

In using my improved wood-screw, the usual method of driving the saine (and from which carpenters and others seldom deviate) maybe continued with advantage, for in driving 1n y wood-screw the conical or tapering point will not break, cut, or drive the bers of the wood before it, or clog up the thread, but will, from its peculiar form, (in being driven througln) onlyr spread the iibers apart in its advance, leaving the wood unbroken to embrace the thread of the, screw, thus rendering it stable against vibration or jar of the wood; besides, my woodscrew, combining the property of' piercer and screw, will require but one-half the manual power to insert the same in the wood as compared with those in present use.

What I claim as new, and desire to secure by Letters Patent, is-

The above-described wood-screw with the plain cylindrical portion between the point and the threaded portion, substantially as and for the purposes set forth.

In testimony whereof I have hereunto set my signature.

JOHN ABSTERDAM.

Witnesses:

A. NEILL, SAM. F. PRENTIss. 

